This article in The Onion hits the nail on the head when it comes to boredom flirtation: Sorta-Attractive Girl Half-Heartedly Hit On. It’s a dumb thing to do, but I remember having done it once or twice in the past. And it’s funny, when you put it this way… makes you realize that doing that is such a waste of time.
Better to go off and find someone really worth the bother… :)